commit ed8659b51d9f2bad3f004df6033d72cc32d71c0d
author senorblanco@chromium.org <senorblanco@chromium.org@2bbb7eff-a529-9590-31e7-b0007b416f81> Mon Feb 04 17:29:51 2013 +0000
committer senorblanco@chromium.org <senorblanco@chromium.org@2bbb7eff-a529-9590-31e7-b0007b416f81> Mon Feb 04 17:29:51 2013 +0000
tree c9882164b3ce1c63e164bf0434c9505c95f80b6f
parent 83f7c659461d602e498569dab63f04b1b578b742

Implement support for origin-TopLeft render targets in GL backend.

Review URL: https://codereview.appspot.com/7230049

git-svn-id: http://skia.googlecode.com/svn/trunk@7545 2bbb7eff-a529-9590-31e7-b0007b416f81

src/gpu/gl/GrGpuGL_program.cpp

diff --git a/src/gpu/gl/GrGpuGL_program.cpp b/src/gpu/gl/GrGpuGL_program.cpp
index d5e8fbd..28f76de 100644
--- a/src/gpu/gl/GrGpuGL_program.cpp
+++ b/src/gpu/gl/GrGpuGL_program.cpp
@@ -92,13 +92,19 @@
     const SkMatrix& vm = this->getDrawState().getViewMatrix();
 
     if (kStencilPath_DrawType == type) {
-        if (fHWPathMatrixState.fViewMatrix != vm ||
+        if (fHWPathMatrixState.fLastOrigin != rt->origin() ||
+            fHWPathMatrixState.fViewMatrix != vm ||
             fHWPathMatrixState.fRTSize != viewportSize) {
             // rescale the coords from skia's "device" coords to GL's normalized coords,
-            // and perform a y-flip.
+            // and perform a y-flip if required.
             SkMatrix m;
-            m.setScale(SkIntToScalar(2) / rt->width(), SkIntToScalar(-2) / rt->height());
-            m.postTranslate(-SK_Scalar1, SK_Scalar1);
+            if (kBottomLeft_GrSurfaceOrigin == rt->origin()) {
+                m.setScale(SkIntToScalar(2) / rt->width(), SkIntToScalar(-2) / rt->height());
+                m.postTranslate(-SK_Scalar1, SK_Scalar1);
+            } else {
+                m.setScale(SkIntToScalar(2) / rt->width(), SkIntToScalar(2) / rt->height());
+                m.postTranslate(-SK_Scalar1, -SK_Scalar1);
+            }
             m.preConcat(vm);
 
             // GL wants a column-major 4x4.
@@ -128,14 +134,23 @@
             GL_CALL(LoadMatrixf(mv));
             fHWPathMatrixState.fViewMatrix = vm;
             fHWPathMatrixState.fRTSize = viewportSize;
+            fHWPathMatrixState.fLastOrigin = rt->origin();
         }
-    } else if (!fCurrentProgram->fViewMatrix.cheapEqualTo(vm) ||
+    } else if (fCurrentProgram->fOrigin != rt->origin() ||
+               !fCurrentProgram->fViewMatrix.cheapEqualTo(vm) ||
                fCurrentProgram->fViewportSize != viewportSize) {
         SkMatrix m;
-        m.setAll(
-            SkIntToScalar(2) / viewportSize.fWidth, 0, -SK_Scalar1,
-            0,-SkIntToScalar(2) / viewportSize.fHeight, SK_Scalar1,
+        if (kBottomLeft_GrSurfaceOrigin == rt->origin()) {
+            m.setAll(
+                SkIntToScalar(2) / viewportSize.fWidth, 0, -SK_Scalar1,
+                0,-SkIntToScalar(2) / viewportSize.fHeight, SK_Scalar1,
             0, 0, SkMatrix::I()[8]);
+        } else {
+            m.setAll(
+                SkIntToScalar(2) / viewportSize.fWidth, 0, -SK_Scalar1,
+                0, SkIntToScalar(2) / viewportSize.fHeight,-SK_Scalar1,
+            0, 0, SkMatrix::I()[8]);
+        }
         m.setConcat(m, vm);
 
         // ES doesn't allow you to pass true to the transpose param,
@@ -156,6 +171,7 @@
                                             mt);
         fCurrentProgram->fViewMatrix = vm;
         fCurrentProgram->fViewportSize = viewportSize;
+        fCurrentProgram->fOrigin = rt->origin();
     }
 }